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 May 12th 2016, 03:58 PM #1 Junior Member   Join Date: May 2016 Posts: 1 Homework problem hello all i have a problem to my homework , in the balloon with 4 liter volume , is 1 gram of hydrogen. how molecules of this gas as found in 1cm3, if the molar mass of hydrogen is 2g/mol ? please help me i need a solution
 May 13th 2016, 06:49 AM #2 Physics Team     Join Date: Jun 2010 Location: Morristown, NJ USA Posts: 2,326 I'll step you through this: 1. The molecular density of H2 is 2 g/mole, so one gram of H2 is equivalent to how many moles? 2. Multiply the result of part (1) by the number of molecules in a mole. This tells you how many H2 molecules are in the balloon. 3. The balloon is 4 liters in volume - convert this to cm^3 (there are 1000 cm^3 per liter). 4. Divide the answer from (2) by the answer from (3), to get molecules per cm^3. Post back with your answer and we'll check to make sure it's correct.

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